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      1 /*
      2  * Copyright (c) 1994, 1995, 1996
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the Computer Systems
     16  *	Engineering Group at Lawrence Berkeley Laboratory.
     17  * 4. Neither the name of the University nor of the Laboratory may be used
     18  *    to endorse or promote products derived from this software without
     19  *    specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef ftmacros_h
     35 #define	ftmacros_h
     36 
     37 /*
     38  * Define some feature test macros to make sure that everything we want
     39  * to be declared gets declared.
     40  *
     41  * On some UN*Xes we need to force strtok_r() to be declared.
     42  * We do *NOT* want to define _POSIX_C_SOURCE, as that tends
     43  * to make non-POSIX APIs that we use unavailable.
     44  * XXX - is there no portable way to say "please pollute the
     45  * namespace to the maximum extent possible"?
     46  */
     47 #if defined(sun) || defined(__sun)
     48   /*
     49    * On Solaris Clang defines __EXTENSIONS__ automatically.
     50    */
     51   #ifndef __EXTENSIONS__
     52     #define __EXTENSIONS__
     53   #endif
     54 
     55   /*
     56    * We also need to define _XPG4_2 in order to get
     57    * the Single UNIX Specification version of
     58    * recvmsg().
     59    */
     60   #define _XPG4_2
     61 #elif defined(_hpux) || defined(hpux) || defined(__hpux)
     62   #define _REENTRANT
     63 
     64   /*
     65    * We need this to get the versions of socket functions that
     66    * use socklen_t.  Define it only if it's not already defined,
     67    * so we don't get redefinition warnings.
     68    */
     69   #ifndef _XOPEN_SOURCE_EXTENDED
     70     #define _XOPEN_SOURCE_EXTENDED
     71   #endif
     72 
     73   /*
     74    * XXX - the list of PA-RISC options for GCC makes it sound as if
     75    * building code that uses a particular vintage of UNIX API/ABI
     76    * is complicated:
     77    *
     78    *    https://gcc.gnu.org/onlinedocs/gcc/HPPA-Options.html
     79    *
     80    * See the description of the -munix flag.
     81    *
     82    * We probably want libpcap to work with programs built for any
     83    * UN*X standard.  I'm not sure whether that's possible and, if
     84    * it is, what sort of stuff it'd have to do.
     85    *
     86    * It might also be a requirement that we build with a special
     87    * flag to allow the library to be used with threaded code, at
     88    * least with HP's C compiler; hopefully doing so won't make it
     89    * *not* work with *un*-threaded code.
     90    */
     91 #else
     92   /*
     93    * Turn on _GNU_SOURCE to get everything GNU libc has to offer,
     94    * including asprintf(), if we're using GNU libc.
     95    *
     96    * Unfortunately, one thing it has to offer is a strerror_r()
     97    * that's not POSIX-compliant, but we deal with that in
     98    * pcapint_fmt_errmsg_for_errno().
     99    *
    100    * We don't limit this to, for example, Linux and Cygwin, because
    101    * this might, for example, be GNU/HURD or one of Debian's kFreeBSD
    102    * OSes ("GNU/FreeBSD").
    103    */
    104   #define _GNU_SOURCE
    105 
    106   /*
    107    * We turn on both _DEFAULT_SOURCE and _BSD_SOURCE to try to get
    108    * the BSD u_XXX types, such as u_int and u_short, defined.  We
    109    * define _DEFAULT_SOURCE first, so that newer versions of GNU libc
    110    * don't whine about _BSD_SOURCE being deprecated; we still have
    111    * to define _BSD_SOURCE to handle older versions of GNU libc that
    112    * don't support _DEFAULT_SOURCE.
    113    *
    114    * But, if it's already defined, don't define it, so that we don't
    115    * get a warning of it being redefined if it's defined as, for
    116    * example, 1.
    117    */
    118   #ifndef _DEFAULT_SOURCE
    119     #define _DEFAULT_SOURCE
    120   #endif
    121   /* Avoid redefining _BSD_SOURCE if it's already defined as for ex. 1 */
    122   #ifndef _BSD_SOURCE
    123     #define _BSD_SOURCE
    124   #endif
    125 #endif
    126 
    127 #endif
    128